code: def _multiprocessing_setup(self) -> None:
      assert self._settings
      if self._settings.start_method == "thread":
          return
  
      # defaulting to spawn for now, fork needs more testing
      start_method = self._settings.start_method or "spawn"
  
      # TODO: use fork context if unix and frozen?
      # if py34+, else fall back
      if not hasattr(multiprocessing, "get_context"):
          return
      all_methods = multiprocessing.get_all_start_methods()
      logger.info(
          "multiprocessing start_methods={}, using: {}".format(
              ",".join(all_methods), start_method
          )
      )
      ctx = multiprocessing.get_context(start_method)
      self._multiprocessing = ctx
  
imports: import importlib.machinery
  import logging
  import multiprocessing
  import os
  import queue
  import sys
  import threading
  from typing import TYPE_CHECKING, Any, Callable, Dict, Optional, Union, cast
  import wandb
  from wandb.sdk.interface.interface import InterfaceBase
  from wandb.sdk.interface.interface_queue import InterfaceQueue
  from wandb.sdk.internal.internal import wandb_internal
  from wandb.sdk.internal.settings_static import SettingsStatic
  from wandb.sdk.lib.mailbox import Mailbox
  from wandb.sdk.wandb_manager import _Manager
  from wandb.sdk.wandb_settings import Settings
label_desc: Use image node_id 3 for calling the Backend obj's underlying member method code with example usage: obj._multiprocessing_setup() without return types